Dear GregValiant,
Thank you very much for your response. I immediately tried your suggestion and obtained a significant improvement. However, I also realized that I can no longer avoid delving into the analysis of the G-code if I want to be aware of the problems and how to solve them.
So, here I go! I started studying the various commands and interpreting at least the first lines of settings of the various programs. Among other things, I use various CNC machines (lathe and mill) for which knowledge of G-code could help me understand and solve various issues.
Now back to the main problem. Your proposal has solved the issue to a large extent (let's say 90%). However, the problem arised again at the beginning of the brim, with an abnormal filament extrusion. In fact, the function you made me removing with the "semicolon" is repeated at the beginning of the brim:
G1 F2400 E0
So now I have two questions:
-
Analyzing the command, I simply expect it to extrude zero material and set a speed of 2400 mm/min for subsequent movements: is that correct? If yes, then why does it extrude material?
-
Is the extrusion considered relative or absolute? I think it's the latter... I ask this because if I've given a retraction command in the preceding lines (for example, -6.5mm), giving E0 will either push the filament forward by 6.5mm or "reset the variable," and the next command will extrude from -6.5mm?
I hope I've been clear, and thank you for your valuable support.
Ugo
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GregValiant 1,342
I think your first image shows this one at the end of your StartUp Gcode.
M82 ; absolute extrusion mode.
<code>
G92 E0
G1 E-1.5 F1800 ;This is a retraction of 1.5mm
G0 Z0.5 ; move the Z
G1 E0 F300 ; this is a prime of 1.5 while the nozzle is still at the end of the purge arc.
Put a semi-colon in front of that last line and see if it makes a difference on the end of the purge line.
An option would be to change the "G1 E0 F300" line to "G92 E0".
To check the skirt/brim problem you need to post a gcode file. Changing that last prime line might fix it if Cura is adding a prime at the start of the skirt/brim.
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